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Urban Public Transport with the Use of Electric Buses – Development Tendencies

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Urban Public Transport with the Use of Electric Buses – Development Tendencies TRANSPORT PROBLEMS 2016 Volume 11 Issue 4 PROBLEMY TRANSPORTU DOI: 10.20858/tp.2016.11.4.12 battery electric bus, public transport, alternative drive Stanisław KRAWIEC*, Bogusław ŁAZARZ, Sylwester MARKUSIK, Grzegorz KAROŃ, Grzegorz SIERPIŃSKI, Krzysztof KRAWIEC Silesian University of Technology, Faculty of Transport, Department of Transport Systems and Traffic Engineering Krasińskiego 8, 40-019 Katowice, Poland Ryszard JANECKI University of Economics Katowice, Faculty of Economics 1 Maja 47, 40-019 Katowice, Poland *Corresponding author. E-mail: [email protected] URBAN PUBLIC TRANSPORT WITH THE USE OF ELECTRIC BUSES – DEVELOPMENT TENDENCIES Summary. The programing documents of the European Union determine the direction of transport systems development, including large cities and agglomerations. The context of these actions which aim to transform into ecologically clean and sustainable transport system is a significant reduction of greenhouse gas emissions. Assuming that public transport will significantly reduce the use of combustion-powered buses, studies on urban logistic enabling the use of electric buses for public transport are needed. The article presents the variants and scenarios for electric buses implementation in urban public transport, as well as the decision algorithm to support electric bus implementation based on technological, organisational, economic and ecological variables. TRANSPORT PUBLICZNY W AGLOMERACJACH Z WYKORZYSTANIEM AUTOBUSU ELEKTRYCZNEGO – TENDENCJE ROZWOJU Streszczenie. Dokumenty programowe Unii Europejskiej wytyczają kierunki rozwoju systemu transportowego także w dużych miastach i aglomeracjach. Kontekstem tych działań, mających na celu przemianę systemu transportowego w transport ekologiczny i zrównoważony, jest znaczące ograniczanie emisji gazów cieplarnianych. Zakładając, że w transporcie publicznym nastąpi znaczne ograniczenie wykorzystania autobusów z napędem spalinowym, niezbędne są badania nad logistyką miejską, umożliwiające wykorzystanie autobusów elektrycznych do transportu publicznego. W artykule przedstawiono warianty i scenariusze wdrażania autobusów elektrycznych w publicznym transporcie zbiorowym oraz zaprezentowano algorytm wsparcia decyzji na podstawie zmiennych technicznych, organizacyjnych, ekonomicznych i ekologicznych. 1. INTRODUCTION For many years, there were worldwide concerns about the impact on air pollution caused by road transport [1]. Dynamic development of road transport entails negative consequences for society. It creates a significant dependence on imported energy and fuels, resulting in transportation being more burdensome on the environment [2]. The global trend towards clean and energy- efficient vehicles 128 S. Krawiec, B. Łazarz, S. Markusik, G. Karoń, G. Sierpiński, K. Krawiec, R. Janecki is because of the concerns for fossil fuels vehicles’ usage on public health, climate change and energy security of European Union states and beyond (e.g. China) [3]. Gradual elimination of conventional vehicles from cities will contribute significantly to the reduction of oil dependence, greenhouse gas emissions, local air pollution and noise pollution [4]. Despite European Union’s decreasing carbon dioxide (CO2) emissions, transport share in harmful substances emissions (CO2, CH4, N2O) has increased from 8% to 10%, between 2000 and 2012 [5]. In view of this, efforts are being made to reduce the emissions of harmful substances from transport vehicles. According to the White Paper [6], a 60% cut in transport emissions will be made by the middle of the century. These objectives should be read in conjunction with the document entitled ‘A resource-efficient Europe – Flagship initiative under the Europe 2020. The document states that European economic growth must be decoupled from the use of resources by reducing CO2 emissions, promoting greater energy security, and reducing the resource intensity of what is consumed and used across the European Union [7]. Attention should be paid to the European Green Cars Initiative [8] as it is a long-term roadmap for implementation of the electric vehicle market. Ehrler and Hebes [9] consider electromobility as one of the technologies that would contribute to the realisation of the European Union’s targets presented above. Electromobility should be viewed in a systemic perspective to assess whether it is an economically viable option reducing greenhouse gas (GHG) emissions in the transport sector [10]. Market requirements expressed by passengers’ expectation, as well as European Union policy on transport development and environmental protection, force research and development on technological strategies of battery charging or exchanging, and economic and organisational aspects of electric buses implementation [Fig. 1]. Fig. 1. Factors affecting the development of electromobility Rys. 1. Czynniki wpływające na rozwój elektromobilności At present, the overwhelming majority of bus fleet operated by public transport companies are conventionally-fuelled diesel buses, which are a source of toxic substances emitters [11, 12]. In 2011, European urban mobility consumed about 140 million tons of oil, and emitted about 470 million tons equivalent of CO2 [13]. Due to the data presented in [14], any significant reduction of the impact of city public transport on the environment can only be achieved by applying alternative drive systems. Battery Electric Vehicle (BEV), may have different emission and energy advantages [15]. Electric vehicles are much more environmentally friendly, as their engines consume less energy, have greater efficiency as well as use the phenomenon of energy recovery [16]. For several years, pilot implementations of electric buses were carried out which resulted in 1.2% share of electric buses, according to the survey in [17]. Urban public transport with use of electric buses… 129 2. ELECTRIC BUSES IMPLEMENTATION SCENARIOS The decisions concerning conducting the process of electric buses implementation to urban public transport must be made by entities that provide public transport service, e.g., public transport companies. There are many problems and challenges associated with electric buses implementation in urban public transport: battery charging or exchanging stations location, choice of bus routes to be electrified, likewise questions related to electric buses implementation management. All these factors will implicate new solutions within technological, economic and organisational aspects of their business activity. An enterprise may adopt various scenarios of fleet exchange, taking into account financial capacities and the date limits described in the White Paper [6], or another national or international strategy paper. In the White Paper, there are two important date limits: half the use of conventionally- fuelled cars in urban transport by 2030 and phase them out from cities by 2050, as well as achieving CO2 - free city logistics in major urban centres by 2030. Fig. 2. Bus fleet exchange variants to be conducted by public transport companies Rys. 2. Warianty wymiany floty autobusów, które są możliwe do przeprowadzenia przez przedsiębiorstwa komunikacji miejskiej These two important dates are highlighted in Fig. 2, which depicts three possible scenarios of bus fleet exchange resulting in decreasing share of conventionally- fuelled buses: - variant A – a passive scenario wherein a public transport company protracts the process of fleet exchange awaiting expected effect of electric buses’ technological maturity, - variants B – normative scenarios, assuming linear or quasi-linear financing and execution of fleet exchange wherein 50% of conventional fleet is replaced by electric buses in 2030, - variant C – an active scenario wherein the fleet is exchanged, as soon as possible, by getting a grant for innovative, environmentally-friendly activity. All these variants have advantages and disadvantages involving opportunities and threats, for the particular public transport company. These include perspectives to gain funding, which affects the 130 S. Krawiec, B. Łazarz, S. Markusik, G. Karoń, G. Sierpiński, K. Krawiec, R. Janecki total cost of the exchanging process, the level of fleet homogeneity in the sense of a bus brand and technological generation of the fleet, the complexity of the exchange process. The variants A, B, and C of bus fleet exchange can be elaborated more specifically in terms of how to exchange the fleet: - scenario I – one-off exchange to be carried out as soon as possible, - scenario II – experimental exploitation of one electric bus to test the technology, and posterior one-off exchange of the rest of the fleet, - scenario III – successive replacement of subsequent batches of buses, - scenario IV – awaiting electric buses technological maturity and execution of the exchange process in the most advantageous moment. Scenario I corresponds to the active scenario (variant A) of bus fleet exchange. In Fig. 3, exemplary characteristics (xn=x1, x2,…,xi) of scenario I are given. There are three points put on the timeline (x- axis): x1, x2, and xi that describe the moments of one-off exchange of bus fleet owned by these companies. The specific moment of the exchange differs according to organisational, technical, economic and ecological factors, defined by the local conditions in which a company operates. Fig. 3. Scenario I – one-off exchange to be carried out as soon as possible Rys. 3. Scenariusz I – jednorazowa wymiana, przeprowadzona najszybciej jak to możliwe The decision to execute the one-off
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